The Calibre 41 was perhaps the most common of ladies' wristwatch movements by IWC. 108,100 were made from 1949 to 1970. It was "common" because it worked well, but also keep in mind that very small movements generally can't quite have the accuracy and finesse of finishing of larger movements. It is a good movement.

In fact, this is so helpful that I've taken the liberty of posting most of it on the Watch Talk Forum where I asked the same question. I haven't put your name in case you weren't happy for me to do so. Here's the link: